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From the molecular formula, the compound has "1 degree of unsaturation" (one double bond or ring).
The proton NMR has four groups of peaks; the singlet at 
3.6 (3H) is consistent with an isolated CH3 group adjacent to an electronegative center, such as oxygen. The sets of highly split doublets centered at 6.5, 4.2 and 4.0 (there is overlap of these at 4.1) span the region where alkene hydrogens are observed. The complex splitting pattern observed resembles an ABC pattern for a terminal alkene.
Click here for a review on proton NMR.
Click here to view a 1H NMR correlation table.
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